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based on an earlier version of the Wolfram Language.
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Head

FilledSmallSquareHead[expr] gives the head of expr.

FilledSmallSquare Examples: Head[f[x]] LongRightArrow; Head[a + b] LongRightArrow; Head[4] LongRightArrow; Head[x] LongRightArrow.

FilledSmallSquare See The Mathematica Book: Section 2.1.1 and Section 2.1.1.

Further Examples

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